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Simplifying -7(-3) + -1[8 + -1(3 + -4)] = 0 Multiply -7 * -3 21 + -1[8 + -1(3 + -4)] = 0 Combine like terms: 3 + -4 = -1 21 + -1[8 + -1(-1)] = 0 Multiply -1 * -1 21 + -1[8 + 1] = 0 Combine like terms: 8 + 1 = 9 21 + -1[9] = 0 Multiply -1 * 9 21 + -9 = 0 Combine like terms: 21 + -9 = 12 12 = 0 Solving 12 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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